Revising the OO docs - take 2

So after a hiatus, I'm back with more revisions. Here's where I'm at:
perlootut.pod - This is a new document. As you might expect from the name,
it's an OO tutorial focused on teaching some basic OO concepts and then
pointing people at CPAN.
perlobj.pod - This has been completely rewritten. It explains "old school"
Perl 5 OO, and I tried to hit every Perl 5 OO related feature I could
think of, since there is supposed to be a reference document. If I missed
something, let me know and I'll ad it.
perlref.pod - I added a section on circular refs. There was something
about this in perlobj, but it was ancient and didn't even mention weak
refs. BTW, there was basically _no_ docs on weaken in the core before this
change, so I think this is a good change all on its own.
You can read these here:
perlootut -
https://github.com/autarch/perl/blob/drolsky%2Foo-docs/pod/perlootut.pod
perlobj -
https://github.com/autarch/perl/blob/drolsky%2Foo-docs/pod/perlobj.pod
perlref -
https://github.com/autarch/perl/blob/drolsky%2Foo-docs/pod/perlref.pod
I'd also like to remove all the old OO tutorials and docs. That means
perlboot, perlbot, perltooc, and perltoot. But that can be a separate
discussion.
-dave
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